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patch 9.0.1834: Some problems with xxd coloring

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Problem:  Some problems with xxd coloring
Solution: Fix the following problems:

* Support colored output on Windows.
  SetConsoleMode() is required to enable ANSI color sequences.
* Support "NO_COLOR" environment variable.
  If "NO_COLOR" is defined and not empty, colored output should be
  disabled.
  See https://no-color.org/
* "-R" should only accept "always", "never" or "auto" as the parameter.
* Adjust help and documentation. "-R" cannot omit the parameter. Remove
  surrounding brackets.

Related #12131
closes: #12997
closes: #12991
closes: #12986

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: K.Takata <kentkt@csc.jp>
This commit is contained in:
K.Takata
2023-09-01 18:41:04 +02:00
committed by Christian Brabandt
parent da16a1b471
commit f6fc255e8d
3 changed files with 54 additions and 18 deletions
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4
runtime/doc/xxd.1
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@@ -135,9 +135,9 @@ to read plain hexadecimal dumps without line number information and without a
particular column layout. Additional whitespace and line breaks are allowed
anywhere.
.TP
.IR \-R " "[WHEN]
.IR \-R " " when
In output the hex-value and the value are both colored with the same color depending on the hex-value. Mostly helping to differentiate printable and non-printable characters.
.I WHEN
.I \fIwhen\fP
is
.BR never ", " always ", or " auto .
.TP